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Issues: 1-3
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Condition and productivity of marginal oak and beech plantations in the southern part of the Right Bank Forest Steppe of Ukraine

Sergiy Koval (1), Olexandr Ostapchuk (1), Volodymyr Shlapak (1), Olexandr Bayura (1), Olexandr Sovakov (2), Volodymyr Vitenko (3)*, Roman Podzerei (3), and Oleh Lazariev (1)

1. Department of Forestry, Faculty of Forestry and Landscape Gardening, Uman National
University of Horticulture, Uman, Ukraine. *E-mail: uman.vitenko@ukr.net
2. National University of Life and Environmental Sciences of Ukraine, Kyiv, Ukraine.
3. Pavlo Tychyna Uman State Pedagogical University, Uman, Ukraine.

Abstract:

The condition and productivity of marginal oak-beech plantations in the conditions of fresh hornbeam grove of the southern part of the Right Bank Forest Steppe of Ukraine, outside the natural habitat of European beech have been studied. It was found that with the observance of agricultural techniques and timely silvicultural care and felling of plantations at the age of 19–20 productive crops are formed with an average height of beech trees 9.2–10.4 m, diameter 11.8–12.7 cm, preservation of 352–386 pieces·ha-1, which grow according to Ib class of quality. In the studied oak-beech crops of European beech trees lag behind in growth from common oak trees, but according to taxonomic indicators, hornbeam, sharp-leaved maple, birch and heart-leaved linden trees predominate. The prospects of growing of beech in non-range conditions have been established, as it can compete with aboriginal forest species.

Received: 19 September 2022 / Accepted: 04 January 2023 / Available online: 18 January 2023

Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License.

(Forestry Ideas, 2023, Vol. 29, No. 1) [Download]
Downloads: 16

Bioinsecticidal activity of essential oil of Mentha arvensis L. grown in forest area on Helicoverpa armigera Hub. in tobacco and Apis mellifera L.

Zheko Radev

Tobacco and tobacco products institute, Agricultural Academy, Bulgaria.
E-mail: zhekoradev@abv.bg

Abstract:

In laboratory conditions bioinsecticidal effect of Mentha arvensis L. essential oil (EO) on Helicoverpa armigera Hub. 3rd instar larva on tobacco and Apis mellifera L. was found. There were differences between the efficacy of the divers concentrations. Good bioinsecticidal effect of 48 % was detected at concentration of 1.25 % v/v, high effect of 92 % at concentration of 2.5 % v/v and 100 % efficacy at 5 % v/v. Phytotoxicity on tobacco plants was found only at 5 % v/v EO concentration. The concentrations of 2.5 % v/v and even the less than 1.25 % v/v could be used to control the pest H. armigera. Concentrations of 1.25 % v/v and 2.5 % v/v applied under the same conditions to A. mellifera showed 100 % toxicity to the bees as well.

Received: 25 October 2022 / Accepted: 09 January 2023 / Available online: 18 January 2023
 
Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License. 
 

(Forestry Ideas, 2023, Vol. 29, No. 1) [Download]
Downloads: 15

Test for contact toxicity of Thymus pulegioides L. essential oil on Helicoverpa armigera Hub. in tobacco and Apis mellifera L.

Zheko Radev

Tobacco and tobacco products institute, Agricultural Academy, Bulgaria.
E-mail: zhekoradev@abv.bg

Abstract:

Thymus pulegioides L. essential oil (EO) in different concentrations was tested in laboratory conditions on Helicoverpa armigera Hub. 3rd instar larva on tobacco and Apis mellifera L. bees, and the results showed bioinsecticidal activity. Differences were found between the effectiveness of various concentrations as higher concentrations showed higher efficiency. Low toxicity of 36 % was found at concentration of 1.25 % essential oil, concentration of 2.5 % produced high toxicity of 76 % while concentration of 5 % produced 100 % toxicity. All the concentrations of T. pulegioides EO tested in the same conditions on A. mellifera showed 100 % toxicity.

Received: 25 October 2022 / Accepted: 09 January 2023 / Available online: 18 January 2023

Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License.

(Forestry Ideas, 2023, Vol. 29, No. 1) [Download]
Issues: 1-3